Electrochemical and Electronic Structure Investigations of the [S<sub>3</sub>N<sub>3</sub>]<sup>•</sup> Radical and Kinetic Modeling of the [S<sub>4</sub>N<sub>4</sub>]<sup><i>n</i></sup>/[S<sub>3</sub>N<sub>3</sub>]<sup><i>n</i></sup> (<i>n</i> = 0, −1) Interconversion
作者:René T. Boeré、Tristram Chivers、Tracey L. Roemmele、Heikki M. Tuononen
DOI:10.1021/ic900742q
日期:2009.8.3
simulations of the CVs detected slow rates of electron transfer for both couples and allowed for a determination of rate constants for homogeneous chemical reaction steps subsequent to electron transfer. The common parameters (kf1 = 2.0 ± 0.5 s−1, ks1 = 0.034 ± 0.004 cm s−1 for [S4N4]−/0; kf2 = 0.4 ± 0.2 s−1, ks2 = 0.022 ± 0.005 cm s−1 for [S3N3]−/0 at T = 21 ± 2 °C) fit well to a “square-scheme” mechanism
在玻璃碳电极上,在CH 2 Cl 2中同时采用循环(CV)和旋转盘(RDE)方法对S 4 N 4进行伏安研究,发现在-1.00 V时单电子还原(二茂铁/二茂铁),产生-0.33 V下的第二个氧化还原对,通过对其盐的CV研究证实是电化学生成的[S 3 N 3 ] -。扩散系数(CH 2氯2 /0.4 M [ Ñ卜4 N] [PF 6 ])通过RDE方法估计:S 4 Ñ 4,1.17×10 -5厘米2s -1 ; [S 3 N 3 ] -,4.00×10 -6 cm 2 s -1。CV的数字仿真检测到两对电子的电子转移速率较慢,并可以确定电子转移后均相化学反应步骤的速率常数。常用参数(对于[S 4 N 4 ] -/ 0,k f1 = 2.0±0.5 s -1,k s1 = 0.034±0.004 cm s -1;k f2 = 0.4±0.2 s -1,k s2对于[S 3 N 3 ] -/ 0在T